Replay levels:
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If there are particular levels that you cant complete, try replaying them.
You will get different drops each time you play and you will eventually be
able to beat all levels. It might prove to be a bit frustrating, but its
doable if you are patient and strategize a bit when it comes to the matches
that you make.

Try to focus on elements:
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Try to ignore one type of elements for a couple of matches in order to allow
for that type of element to fill the board and therefore make it a lot easier
for you to create a super-lengthy match, which will give you a lot more thanks
to the bonus. Also, try to match one or two types of elements in order to
allow the board to be filled with what you need.